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Flow instabilities of epoxide prepolymers

โœ Scribed by J. V. Aleman

Publisher
Society for Plastic Engineers
Year
1983
Tongue
English
Weight
409 KB
Volume
23
Category
Article
ISSN
0032-3888

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โœฆ Synopsis

Abstract

Flow of molten epoxide prepolymer (T~g~ = 303 K, Mฬ„~n~ 889, Mฬ„~u~/Mฬ„~n~ = 1.46) shows stress jumps. A hydrodynamic explanation is forwarded, and a check of the theoretical jump is carried out, with shear viscosites and shear moduli measured at 361 K. The increase in pressure produces a decrease in volume, which increases the rigidity of the polymer, which is then reduced by relaxation of the compressed chain segments.

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